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improving voltage quality and reducing power loss were the main goals of power system reactive optimization. The traditional method could reach the best economic benefit by optimizing the power flow, when the margin of the power system was enough. Nowadays, the safety grows more and more important because of the development of power system. Static voltage stability margin is an important index of power system safety. A new hybrid optimization had been put forward in this paper. The goal of this method was giving consideration to reducing power loss and increasing static voltage stability margin. At last, a simulation of IEEE-30 was made in this paper. The result of simulation showed this method is very effective. Keywords-voltage stability; reactive optimization; multi-objective genetic algorithmI.

The stability of constant delay neutral neural network dynamic system is studied in this paper. A new Lyapunov functional method is proposed. The method can solve the problem which stability of constant delay neutral neural network dynamic system. Index Terms -Neutral neural networks, stability , Lyapunov functional.